Magnetism near half-filling of a Van Hove singularity in twisted graphene bilayer

Yi Wen Liu, Jia Bin Qiao, Chao Yan, Yu Zhang, Si Yu Li, Lin He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Twisted graphene bilayers (TGBs) with slight twist angle always have low-energy Van Hove singularities (VHSs) that are strongly localized around AA-stacked regions of the moiré pattern. The localized VHSs are strongly related to novel correlated quantum states, such as Mott-like insulating phase and unconventional superconductivity, observed in the slightly TGBs. Here we studied the electronic properties of a TGB with θ∼1.64 and demonstrated that a VHS splits into two spin-polarized states flanking the Fermi energy when the VHS is close to the Fermi level. Such a result indicates that localized magnetic moments emerge in the AA-stacked regions of the TGB. Since the low-energy VHSs can be reached in slightly TGBs, our result therefore provides a facile direction to realize novel quantum phases in graphene system.

Original languageEnglish
Article number201408
JournalPhysical Review B
Volume99
Issue number20
DOIs
Publication statusPublished - 9 May 2019
Externally publishedYes

Fingerprint

Dive into the research topics of 'Magnetism near half-filling of a Van Hove singularity in twisted graphene bilayer'. Together they form a unique fingerprint.

Cite this